You shouldn't need a higher output pusher fan for your car ( * unless, see below) because it's only meant to operate when the A/C system has unusually high pressures (working in extreme heat: e.g., stuck in bumper-to-bumper traffic on a hot summer day) -- 90% of the time it's not running even when the A/C is on, during which your stock (belt driven) "puller" fan should be adequate unless its fan clutch is shot.

[ * You didn't explain this in your opening post, but I have a nagging suspicion that, maybe, you're talking about having removed your belt-driven fan and now you need a larger electric fan to cool your engine's radiator when you're not moving. If this is the case, you should provide this clarification.
Otherwise, if it's just for your A/C, why do you need a larger fan?]